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The Watercooled EVC-0255AW Dry Running Claw pump

The EVC-watercooled Series pumps are dry contact-less vacuum pumps with modular constructions consisting of compartments: pumping and gear chambers are separated by using labyrinth seals. As two claws rotate in opposite direction, the air will be sucked in the pumping chamber, compressed and discharged under pressure. Two gears for synchronizing of claws rotation are placed inside the gear chamber and lubricated with appropriate gear oil. A built in anti-suck back valve installed in inlet flange will prevent the air from flowing back into the vacuum chamber when the pump is shutdown. The pumps are directly driven by a flanged motor via a coupling. The claws and compression chamber have a TFE (Teflon) coating to protect the pump against corrosion from water in the pumped gasses. To allow the pump to continuously run at ultimate vacuum of lower then 30 mbar (abs.) we have build in a special developed Water cooling system in the Gear Box and Cylinder.

Advantages to the user:

  • High pumping speed
  • Oil free pumping chamber
  • Corrosion protection by teflon coating
  • Low ultimate vacuum
  • Very little maintenance needed
  • Non contact claw rotation
  • Direct drive
  • Anti-suck back valve to secure vacuum

Part Number

Ordering information Art.No.
EVC-0255AW; 3 phase; 400V; 50Hz; water cooled; 5,5kW motor 604091
EVC-0255AW; 3 phase; 400-460V; 50/60Hz; water cooled; 5,5kW motor 604093
EVC-0255AW; No motor; water cooled 604095



Specification Unit EVC-0255AW
50 Hz 60 Hz
Nominal displacement m3/h 250 300
Ultimate vacuum level mbar <30 <30
Vacuum level continuous running mbar 30 to 1000 30 to 1000
Motor power kW 5,5 5,5
Nominal speed rpm 2850 3450
Noise level (tolerance ±3) dB(A) 78 80
Oil capacity gear box housing ltr 0,8 0,8
Weight approx kg 225 230
Admissible ambient temperature °C 5-40 5-40
Cooling water vol (min.) Ltr >2 l/m >2 l/m
Cooling water temperature °C 25-30 25-30
Connection inlet G(BSP) 2″ 2″
Connection outlet G(BSP) 1-1/2″ 1-1/2″



Accessoires Art.No.
Inlet dust filter with paper cartridge G 2″ 50800
Frequency control unit; controlled at vacuum level 604901


Consumables Art.No.
Repair spray coating; can 400ml 10048900
Gasket kit EVC-0255A/0305A C255490A0
Overhaul kit EVC-0255A C255500A0
Gear box oil type EV-Gear Oil-150 (1 ltr) 100500
Gear box oil type EV-Gear Oil-150 (5 ltr) 100502
Gear box oil type EV-Gear Oil-150 (20 ltr) 100503
Inlet filter replacement cartridge (paper) 508001
Inlet filter replacement cartridge (polyester) 508101
Inlet filter replacement cartridge (inox mesh) 508201
Inlet filter replacement cartridge (activated charcoal) 508301

Pumping speed curve


Dimensions (mm) L W H A B S R
EVC-0255AW 978 609 598 G 2″ G 1-1/2″ 398 490